Prommee, Pipat

Preferred name

Prommee, Pipat

Alternative Name

Prommee, P.

Main Affiliation

School of Engineering

pipat.pr@kmitl.ac.th

Now showing 1 - 10 of 22

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Tunable current-mode log-domain universal filter
(2010-08-31)
Prommee, Pipat
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Somdunyakanok, Montri
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Angkeaw, Krit
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Dejhan, Kobchai
This paper describes the design of a current-mode universal filter based on log-domain filtering concept. The circuit is a direct realization of a first-order differential equation for obtaining the two integrators loop structure. Lossless integrators are realized by log-domain lossy integrators. The proposed filter comprises only two grounded capacitors and sixteen transistors. Frequency response of the proposed filter can be instantaneously controlled over a very wide frequency range by controlling current. Quality factor is independently controlled by another current. It can be seen that the proposed circuit suites for high-frequency applications. A validated BJT model that used in simulation is operated by a single power supply as low as 2.5V. The wide-range frequency response is controlled over five decades of current controlled. ©2010 IEEE.
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Realization of OTA-C current-mode universal filter based on two type integrators loop
(2007-12-01)
Prommee, Pipat
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Somdunyakanok, Montri
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Angkeaw, Krit
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Dejhan, Kobchai
A universal current-mode active filter based on 2 types of integrator, lossy and lossless integrators, is presented. The biquadratic transfer function is obtained by the two integrators loop. The proposed circuit employs only 2 multiple output OTAs (MO-OTA) and 3 capacitors. The parameter Q<inf>P</inf> can be wide-range tuned independent from the ω<inf>P</inf> either changing of capacitor and transconductance gains. Moreover, the four different kind filter functions as lowpass, highpass, bandpass and band-reject response can be also obtained without changing circuit topology. The parameters ω<inf>p</inf> can be electronically tuned through adjusting the transconductance gains of the OTAs. The simulation results have been carried out by PSpice. © 2007 IEEE.
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Log-domain quadrature sinusoidal oscillator based on lossless integrator and all-pass filter
(2011-12-01)
Prommee, Pipat
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Somdunyakanok, Montri
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Angkeaw, Krit
A log-domain current-mode quadrature sinusoidal oscillator based on all-pass filter and lossless integrator is presented. The oscillator is realized by a first-order differential equation for obtaining all pass filter and lossless integrator. The proposed oscillator can be electronically tuned by adjusting bias currents. The proposed oscillator contains 18 NPN transistors, 2 grounded capacitors and 11 bias currents for achieving low-power and fast response. A validated BJT model is used in SPICE simulation operated from a single power supply as low as 2.5V. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortion of signal output is obtained around 0.55%. The oscillation frequency can be operated more than 100MHz which enables fully integrated in telecommunication systems and suitable for high-frequency applications. SPICE simulation results are included. © 2011 IEEE.
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Universal filter and its oscillator modification employing only active components
(2009-01-01)
Prommee, Pipat
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Somdunyakanok, Montri
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Dejhan, Kobchai
An active-only devices current-mode universal fIlter using the biquadratic transfer function is proposed. The proposed circuit is realized based on minimized active-only components count without external passive elements. The electronic resistors are used instead of 2 OTAs. The different kinds of fIlter function such as lowpass, highpass, bandpass and band-reject response can be obtained without changing circuit topology. A quadrature oscillator can also be easily modifIed without changing circuit topology. The proposed circuit is realized by using 4 MOS transistors, 3 OTAs, and 2 Opamps. The parameters ~ and Qp can be electronically tuned independently through adjusting the transconductance gains of the OTAs. The simulation results are given by PSpic.
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CMOS-based current-controlled DDCC and its applications
(2010-08-31)
Prommee, Pipat
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Somdunyakanok, Montri
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Toomsawasdi, Sompongse
This paper presents design of an active building block for analog signal processing, named as current-controlled differential difference current conveyor (CCDDCC). Its parasitic resistances at X-terminal can be controlled by an input bias current. The proposed element is realized in a CMOS technology. It displays usability of the new active element, where the maximum bandwidth of voltage and current followers are around 1GHz, 100MHz, respectively. The THD is obtained around 0.8% within 0.6Vpp input range. The power dissipation of a CCDDCC at 10μA biased current is obtained around 1.35mW with ±1.25V power supplies. In addition, current-mode multiple-input single output (MISO) second-order universal analog filter is included as the applications. The filter offers the realization of simultaneous five type standard filter responses. The quality factor and the frequency response parameters can be independently tuned. SPICE simulation results of proposed CCDDCC and its applications are also presented. ©2010 IEEE.
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Single low-supply and low-distortion CMOS Analog Multiplier
(2005-12-01)
Prommee, Pipat
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Somdunyakanok, Montri
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Angkaew, Krit
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Jodtang, Arkhom
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Dejhan, Kobchai
A single low-supply CMOS Analog Multiplier based upon ohmic region of MOS transistors is presented. This paper describes a method to force the drain-source voltage (V<inf>DS</inf>) of MOS transistors to operate in ohmic region. The achieved circuit can be used a single low-power supply. The complete circuit contains 20 transistors and 8 current sources using a low-power supply +1.5 volts. This circuit has high performance with very high-linearity and low-distortion. The achieved input dynamic range operation is ±400mV, the linearity error is smaller than 0.1% and total harmonic distortion is smaller than 0.25% for input range 800mVp-p. © 2005 IEEE.
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Quadrature sinusoidal oscillator based on log-domain high-pass and low-pass filters
(2011-10-13)
Prommee, Pipat
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Prapakorn, Nattawit
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Somdunyakanok, Montri
A log-domain current-mode quadrature sinusoidal oscillator (QSO) based on low-pass (LP) and high-pass (HP) filters is presented. The log-domain QSO is realized by using only 18 NPN transistors and 2 grounded capacitors for achieving low-power and fast response. The proposed oscillator uses a cascade connecting the LP and HP which can be electronically tuned through bias current. Frequency of oscillation can be tuned over a wide-range with a low-power supply as 2V which is suitable for IC production. The power consumption is obtained around 5.5mW at 100μA of bias current. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortion of QSO at 10.63MHz is obtained around 1.25%. The proposed circuit is suitable for high-frequency applications. PSpice simulation confirms the theoretical results. © 2011 IEEE.
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Single low-supply current-mode CMOS analog multiplier circuit
(2006-12-01)
Prommee, Pipat
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Somdunyakanok, Montri
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Kumngern, Montree
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Dejhan, Kobchai
A simple structure of low-voltage current-mode CMOS analog multiplier circuit is presented. This multiplier circuit is based-upon quarter square algebraic identity technique by using CMOS technology. The transistors are operated in saturation region for different sub-circuits. The electronic resistor circuits are used as the input stage. The differential amplifiers are used for biased the squaring circuits. The current-mode operation can be obtained with a single supply, low-voltage, high-linearity and wide-bandwidth. This paper consists of 16 NMOSs with a 1.5 volts single supply. The achieved circuit performances have been carried out by PSpice. The input range is obtained more than ±100μA with linearity error less than 1%. The frequency response can be operated larger than 150 MHz. © 2006 IEEE.
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CMOS-based current-mode tunable ladder Elliptic low-pass filter
(2015-10-09)
Prommee, Pipat
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Kunto, Terdsak
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Somdunyakanok, Montri
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Prommee, Tanakrit
This paper presents a tunable CMOS-based third-order low-pass filter that can be operated in high frequency. The proposed low pass filter is designed based on Elliptic Ladder low-pass filter prototype. The proposed filter structure is constructed by using two lossy integrators and a lossless integrator. The proposed filter comprises only 18 transistors. The frequency responses of low-pass filter can be electronically tuned between 10kHz and 100MHz through bias current from 0.01 μA to 100 μA. The circuit used 1.5 V power supply with 3mW power consumption at 100 μA bias current. Using of the grounded capacitors which is suitable for further integration. THD of low-pass filter can be obtained less than 1% along the operating frequencies. PSPICE simulation results are carried out to confirm the theory by using TSMC 0.18μm technology.
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CCCII-based multiphase sinusoidal oscillator employing high-pass sections
(2009-10-22)
Prommee, Pipat
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Somdunyakanok, Montri
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Angkeaw, Krit
This paper proposes a new approach to implement a multiphase sinusoidal oscillator by using loop-back of n-cascaded high-pass sections form. Two CMOS Current-controlled Current Conveyors (CCCII) and a grounded capacitor are constructed as a current-mode high-pass section for each phase. The orthogonally of oscillate condition and frequency of oscillation are obtained with their electronically controllable through current biased of CCCII. Multiphase sinusoidal outputs can be obtained with equally spaced in phase, 360/n degree. Third-order oscillator is raised up to confirm the theoretical agreement. Low-harmonic distortion of achieved sinusoidal output obtains less than 0.9%. The performances are carried out by PSpice for confirm its characteristics. ©2009 IEEE.

Prommee, Pipat

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